Tire-alarm switch



w. H. BONEv JR TIRE man SWITCH Sept. 16 193i).

Original Filed June 24. 1927 abtomq.

Patented Sept. 16, 1930 UNITED STATES PATENTioI-"ICEQQ WILLIAM HENBYBONE, IR., I' DOUGLAS, GFQBGIA 'rmnamnu swrrcn l I Application med June $74, 1927, Serielle. 801,218. Renewed July 9, 1900.

from the contacts 12. Abus 20isthreadi The present invention relates to tire alarms, and aims to provide a novel and improved device for giving an alarm when the tire of an automobile' or other vehicle becomes deflated.

Another object of the invention is the provision of asimple, practical and eliicient device of that kind which may be readilyattached to the axle adjacent to the wheel.

With the.foregoing and other objects in view, which will be apparent as the descrip-.

tion proceeds, the invention resides in the yconstruction and arrangement of parts, as.

hereinafter described and claimed, it being understood that changes can be made lwithin the scope of what is claimed, without departin from thev spirit of the invention. he invention is illustrated in the accom panying drawing, wherein Figure 1 is a sectional view of the device as applied to the king pin of one of the front wheels of a motor vehicle, portions being shown in elevation and the electrical circuit being shown diagrammatically.

Figs. 2 and 3 are elevations showing other means for supporting thedevice from axles of different vehicles.

In carrying out the invention there is provided a vertical plunger 7 slidable vertically within a tubular guide 8, and having rollers 9 at its lower end so positioned as not tc contact with the tire 10 when same is in- Hated, as seen in full lines in Fig. 1,i and `to bear on and be lifted by the tire when same is flattened, as seen in dotted lines. The plunger 7 has a switch plate 11 at its upper end adapted to bridge a\ air of contacts 12 when the plunger 7 is raised, so as to close `an electrical circuit 13 including an 14, and battery 15 or other source of electrical current. The circuit also includes a switch 16 in order that the device 14 maybe ycut out, such as when the vehicle isnot in use.

Acoiled sprin 17 surrounds the-plunger 7 within the gui e` 8 and is conned'betwe'en a shoulder or collar 18 in the guideth'ro'u'gh A which theplunger slides and a collar v19 .on themplunger, so as to= yieldingly depress the'plunger and fed within the lower end of t vof the king bolt or a lamlnated leaf with the socket electric horn or other audible signal device, I

and

remove the-switch plate 11` e guide 8 tov support the collar 19 and plungerv 7 and to alsov guide said lunger. The contacts 12 are carried by a ushm within the upper end og the guide 8. v he guide 8 is mounted for vertical and rotary its upper end to screw on thelower terminal in 24 which connects the front wheel with t e front axle. Thus, the socket memberA 22 may replace the nut which is usually employed on the lower'end of the king pin. The lower end of the member 22 is split, as at 25, and has a clamp 26 thereon to cause the lower end of saidv member` to embrace the guide 8 when sai/d guide has been adjusted so as to properly position .the plunger 7.

Fig. 2 illustrates a clamp 27 which fastens spring 28 withan axle 29, member 22 suspended from the bracket 30 that overla s a plate 31 held by the clamp 27', a bolt 32 cllimping the ybracket on' said plate and providing for adjustment of the bracket. As shown, the bracket is offset to accommodate the brake drum of a front or rear axle. v y Fig. 3 illustrates a bracket 30 carrying the socket member 22 and attached to a clamp 27 which is' adjustable on the axle 29', the bracket 30as shown being oiset so as to accommodate the brake drum of a front or. rear wheel. The term deflated as used herein is meant to includepartial as well as complete deflation, when the partial deflation is sucient'to o rate the plunger 7 .a

Havin thus described the invention, what is claime as new'is :f-

. 'A'circuit closing device oi the kind def scribedpcomprising a vertical socket member having athreaded aperture at its upper end having its lower end split, a clamp em-v bracing the lower end portion of said member to contract it, a guide fitted in the lower end portion of the socket member -for vertical adjustment, a bushingremovably secured in the lower end .portion ofthe guide, a plunger.

or plug 21 Asecured adjustment, and for this purpose is telescoped within a dependingtubular socket. member 22 which has the nut portion 23 at sldable in said bushing and having a. collar Y seatable on said bushing', sprin means within the guide for depressing said p nnger, and insulated coo erable contacts carried by said guide and p unger. In testimony whereof I hereunto aix my signature.

WILLIAM HENRYBONE,J1?u 

